Material of natural bamboo wood, lightweight yet durable. Unexpanded- 13.22 W X 7.87 H X 7.28 D; Fully Expanded- 24.4 W X 7.87 H X 7.28 D (in inches). Double-sided fillet, hollow handle design, smooth and delicate surface, waterproof, easy to clean. Sturdy construct - excellent craftsmanship process, not easy to deformation, easy to install. Save space on your office desktop - Perfect for organizing books and loose items on the table. Ideal for storing your books, file folders, magazines, binders, and other documents.